Display Substrate, Display Device and Manufacturing Method of Display Substrate

Abstract

A display substrate includes multiple light emitting devices disposed on a base substrate for emitting light of a third color, and a first encapsulation structure layer and a light conversion layer sequentially stacked on a side of the multiple light emitting devices away from the base substrate; the light conversion layer includes a first quantum dot material emitting light of a first color after receiving the light of the third color emitted by the light emitting devices and a second quantum dot material emitting light of a second color after receiving the light of the third color emitted by the light emitting devices. The first encapsulation structure layer includes a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer that are sequentially stacked in a direction away from the base substrate; the organic encapsulation layer includes an organic encapsulation material and a dye.

1 . A display substrate, comprising a first sub-pixel with emergent light of a first color, a second sub-pixel with emergent light of a second color, and a third sub-pixel with emergent light of a third color disposed on the base substrate;
 the display substrate comprises a plurality of light emitting devices disposed on the base substrate for emitting light of the third color, and a first encapsulation structure layer and a light conversion layer which are sequentially stacked on a side of the plurality of light emitting devices away from the base substrate, and each sub-pixel comprises one of the light emitting devices;   the light conversion layer is configured to emit the light of the first color and the light of the second color after receiving the light of the third color emitted by the plurality of light emitting devices, the light conversion layer comprises a first quantum dot material and a second quantum dot material, the first quantum dot material is configured to emit the light of the first color after receiving the light of the third color emitted by the light emitting devices, and the second quantum dot material is configured to emit the light of the second color after receiving the light of the third color emitted by the light emitting devices;   the first encapsulation structure layer comprises a first inorganic encapsulation layer, an organic encapsulation layer, and a second inorganic encapsulation layer that are sequentially stacked in a direction away from the base substrate; the organic encapsulation layer comprises an organic encapsulation material and a dye, a color of the dye is the same as a color of the light of the third color emitted by the light emitting devices, and a peak wavelength of emergent light of the third color after the light of the third color emitted by the light emitting devices passes through the organic encapsulation layer is different from a peak wavelength of the light of the third color emitted by the light emitting devices.   
     
     
         2 . The display substrate according to  claim 1 , wherein the light conversion layer has an integral structure; or, the light conversion layer comprises a first quantum dot layer located in the first sub-pixel, a second quantum dot layer located in the second sub-pixel, and a light transmissive layer located in the third sub-pixel; the first quantum dot layer is configured to emit the light of the first color after receiving light of the third color emitted by a light emitting device of the first sub-pixel, the second quantum dot layer is configured to emit light of the second color after receiving light of the third color emitted by a light emitting device of the second sub-pixel, and the light transmissive layer is configured to emit light of the third color after the light of the third color emitted by a light emitting device of the third sub-pixel passes through the light transmissive layer. 
     
     
         3 . The display substrate according to  claim 2 , wherein a material of the organic encapsulation layer comprises a mixed material of the organic encapsulation material and the dye, and a material of the organic encapsulation layer of each sub-pixel is the same. 
     
     
         4 . The display substrate according to  claim 2 , wherein the light conversion layer comprises the first quantum dot layer located within the first sub-pixel, the second quantum dot layer located within the second sub-pixel, and the light transmissive layer located within the third sub-pixel; and
 the organic encapsulation layer comprises a first dye in the first sub-pixel, a second dye in the second sub-pixel, and a third dye in the third sub-pixel; a peak wavelength of emergent light of the third color after the light of the third color emitted by the light emitting device of the first sub-pixel passes through the organic encapsulation layer of the first sub-pixel is λ 1 , a peak wavelength of emergent light of the third color after the light of the third color emitted by the light emitting device of the second sub-pixel passes through the organic encapsulation layer of the second sub-pixel is λ 2 , and a peak wavelength of emergent light of the third color after the light of the third color emitted by the light emitting device of the third sub-pixel passes through the organic encapsulation layer of the third sub-pixel is λ 3 , wherein λ 1 , λ 2  and λ 3  are not equal to each other.   
     
     
         5 . The display substrate according to  claim 4 , wherein a surface of the first inorganic encapsulation layer away from the base substrate is provided with a first groove in the first sub-pixel, a second groove in the second sub-pixel, and a third groove in the third sub-pixel;
 the organic encapsulation layer comprises a mixed material layer, the mixed material layer comprises a first mixed material disposed in the first groove, a second mixed material disposed in the second groove, and a third mixed material disposed in the third groove, the first mixed material comprises the organic encapsulation material and the first dye, the second mixed material comprises the organic encapsulation material and the second dye, and the third mixed material comprises the organic encapsulation material and the third dye.   
     
     
         6 . The display substrate according to  claim 5 , wherein the organic encapsulation layer further comprises a film layer formed of the organic encapsulation material disposed on a side of the mixed material layer away from the base substrate. 
     
     
         7 . The display substrate according to  claim 1 , further comprising a color filter layer disposed on a side of the light conversion layer away from the base substrate, the color filter layer comprises a first filter unit located in the first sub-pixel, a second filter unit located in the second sub-pixel, and a third filter unit located in the third sub-pixel; the first filter unit is configured to filter and emit the light of the first color, the second filter unit is configured to filter and emit the light of the second color, and the third filter unit is configured to filter and emit the light of the third color. 
     
     
         8 . The display substrate according to  claim 7 , further comprising a light modulation layer disposed on a side of the color filter layer away from the base substrate, the light modulation layer comprises a first light modulation layer in the first sub-pixel and a second light modulation layer in the second sub-pixel, each of the first light modulation layer and the second light modulation layer comprises at least one prism layer, the at least one prism layer is configured to converge light emitted from the color filter layer of a sub-pixel where the prism layer is located toward a direction of a front viewing angle of the display substrate. 
     
     
         9 . The display substrate according to  claim 8 , wherein the prism layer comprises a plurality of microprisms disposed in parallel; shapes and sizes of cross sections of the plurality of microprisms are the same, or the plurality of microprisms comprise first microprisms and second microprisms which are disposed alternately, and heights of the first microprisms and second microprisms are different. 
     
     
         10 . The display substrate according to  claim 8 , wherein the light of the first color is red light, the light of the second color is green light, and the light of the third color is blue light;
 the first light modulation layer comprises a first prism layer and a second prism layer that are sequentially stacked in the direction away from the base substrate, the first prism layer comprises a plurality of microprisms disposed in parallel and extending in a first direction, the second prism layer comprises a plurality of microprisms disposed in parallel and extending in a second direction, the first direction is perpendicular to the second direction; shapes and sizes of cross sections of the plurality of microprisms of the first prism layer are the same as shapes and sizes of the plurality of microprisms of the second prism layer, or the plurality of microprisms of the first prism layer and the plurality of microprisms of the second prism layer each comprise first microprisms and second microprisms which disposed alternately, and heights of the first microprisms and the second microprisms are different.   
     
     
         11 . The display substrate according to  claim 8 , wherein the light of the first color is red light, the light of the second color is green light, and the light of the third color is blue light;
 the first light modulation layer comprises a first prism layer and a second prism layer stacked sequentially in the direction away from the base substrate, the first prism layer and the second prism layer each comprise a plurality of microprisms disposed in parallel and extending in a first direction; a plurality of microprisms of one of the first prism layer and the second prism layer have the same cross-sectional shape and size, and a plurality of microprisms of the other of the first prism layer and the second prism comprise first microprisms and second microprisms which are disposed alternately, and heights of the first microprisms and the second microprisms are different.   
     
     
         12 . The display substrate according to  claim 8 , wherein the light of the first color is red light, the light of the second color is green light, and the light of the third color is blue light;
 the second light modulation layer comprises a first prism layer and a second prism layer stacked sequentially in the direction away from the base substrate, the first prism layer comprises a plurality of microprisms disposed in parallel and extending in a first direction, the second prism layer comprises a plurality of microprisms disposed in parallel and extending in a second direction, the first direction is perpendicular to the second direction; shapes and sizes of cross sections of the plurality of microprisms of the first prism layer are the same as shapes and sizes of the plurality of microprisms of the second prism layer, or the plurality of microprisms of the first prism layer and the plurality of microprisms of the second prism layer each comprise first microprisms and second microprisms which are disposed alternately, and heights of the first microprisms and the second microprisms are different.   
     
     
         13 . The display substrate according to  claim 8 , wherein the light of the first color is red light, the light of the second color is green light, and the light of the third color is blue light;
 the second light modulation layer comprises a first prism layer and a second prism layer stacked sequentially in the direction away from the base substrate, the first prism layer comprises a plurality of microprisms disposed in parallel and extending in a first direction, the second prism layer comprises a plurality of microprisms disposed in parallel and extending in a second direction, the first direction is perpendicular to the second direction; a plurality of microprisms of one of the first prism layer and the second prism layer have the same cross-sectional shape and size, and a plurality of microprisms of the other of the first prism layer and the second prism comprise first microprisms and second microprisms which are disposed alternately, and heights of the first microprisms and the second microprisms are different.   
     
     
         14 . The display substrate according to  claim 9 , wherein the shapes and sizes of the cross sections of the plurality of microprisms are the same, a cross-sectional shape of each of the microprisms is an isosceles triangle, the isosceles triangle has an apex angle of 60° to 120°, bottom edge length of 20 um to 30 um, and a height of 12 um to 18 um. 
     
     
         15 . The display substrate according to  claim 9 , wherein the plurality of microprisms comprise first microprisms and second microprisms which are disposed alternately, and a cross-sectional shape of each of the first microprisms and the second microprisms is an isosceles triangle; the isosceles triangle of the cross sections of the first microprisms has an apex angle of 60° to 120°, a bottom edge length of 20 um to 32 um, and a height of 12 um to 18 um; the isosceles triangle of the cross sections of the second microprisms has an apex angle of 60° to 120°, a bottom edge length of 14 um to 22 um, and a height of 7 um to 12 um. 
     
     
         16 . The display substrate according to  claim 7 , further comprising a second encapsulation structure layer disposed between the light conversion layer and the color filter layer, wherein a material of the second encapsulation structure layer is an inorganic material. 
     
     
         17 . The display substrate according to  claim 1 , wherein the light emitting devices are blue organic light emitting diode devices, the light of the third color is blue light, the light of the first color is red light, and the light of the second color is green light. 
     
     
         18 . A display device, comprising the display substrate according to  claim 1 . 
     
     
         19 . A method for manufacturing a display substrate, comprising:
 forming a drive structure layer on a base substrate, wherein the drive structure layer comprises a pixel drive circuit;   forming a plurality of light emitting devices emitting light of a third color on a side of the drive structure layer away from the base substrate, the light emitting devices are electrically connected with the pixel drive circuit;   forming a first inorganic encapsulation layer, an organic encapsulation layer and a second inorganic encapsulation layer sequentially on a side of the plurality of light emitting devices away from the base substrate; wherein the organic encapsulation layer comprises an organic encapsulation material and a dye, a color of the dye is the same as a color of the light of the third color emitted by the light emitting devices, and a peak wavelength of emergent light of the third color after the light of the third color emitted by the light emitting devices passes through the organic encapsulation layer is different from a peak wavelength of the light of the third color emitted by the light emitting devices; the organic encapsulation layer is formed by an ink jet printing process; and   a light conversion layer is formed on a side of the second inorganic encapsulation layer away from the base substrate, wherein the light conversion layer is configured to emit the light of the first color and the light of the second color after receiving the light of the third color emitted by the plurality of light emitting devices, the light conversion layer comprises a first quantum dot material and a second quantum dot material, the first quantum dot material is configured to emit the light of the first color after receiving the light of the third color emitted by the light emitting devices, and the second quantum dot material is configured to emit the light of the second color after receiving the light of the third color emitted by the light emitting devices.   
     
     
         20 . A display device, comprising the display substrate according to  claim 2 .